Canvas: An Example of the rotation of Taiji.
Preface
I haven't moved canvas for a long time. I suddenly wanted to review it this afternoon. I wrote a rotating tai chi. Haha, it's fun. Here I will show my own writing process, the css used for rotation is not implemented by the canvas itself. I hope that the big players will not speak out.
Css
body{ background: #ddd;}#canvas{ position: absolute; left: 40%; top: 30%; -webkit-transform: translate(-50%,-50%); -moz-transform: translate(-50%,-50%); -ms-transform: translate(-50%,-50%); -o-transform: translate(-50%,-50%); transform: translate(-50%,-50%); -webkit-animation: testAnimate 3s linear infinite; -o-animation: testAnimate 3s linear infinite; animation: testAnimate 3s linear infinite;}@keyframes testAnimate { from { -webkit-transform: rotate(0); -moz-transform: rotate(0); -ms-transform: rotate(0); -o-transform: rotate(0); transform: rotate(0); } to { -webkit-transform: rotate(360deg); -moz-transform: rotate(360deg); -ms-transform: rotate(360deg); -o-transform: rotate(360deg); transform: rotate(360deg); }}
Html
<body> <canvas id="canvas" width="500" height="500"></canvas></body>
Js
let ctx = document .getElementById("canvas") .getContext("2d");// left-black-bigctx.beginPath();ctx.fillStyle = "#000";ctx.arc(250,250,200,Math.PI/2,Math.PI*1.5,false);ctx.closePath();ctx.fill();// right-white-bigctx.beginPath();ctx.fillStyle = "#fff";ctx.arc(250,250,200,Math.PI/2,Math.PI*1.5,true);ctx.closePath();ctx.fill();// top-black-middlectx.beginPath();ctx.fillStyle = "#000";ctx.arc(250,150,100,Math.PI/2,Math.PI*1.5,true);ctx.closePath();ctx.fill();// bottom-white-middlectx.beginPath();ctx.fillStyle = "#fff";ctx.arc(250,350,100,Math.PI/2,Math.PI*1.5,false);ctx.closePath();ctx.fill();// top-white-smallctx.beginPath();ctx.fillStyle = "#fff";ctx.arc(250,150,25,0,Math.PI*2);ctx.closePath();ctx.fill();// bottom-black-smallctx.beginPath();ctx.fillStyle = "#000";ctx.arc(250,350,25,0,Math.PI*2);ctx.closePath();ctx.fill();
Effect
The above is all the content of this article. I hope it will be helpful for your learning and support for helping customers.
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